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Weather Underground Forecast for Thursday, Dec. 12, 2013
A cold frontal boundary will extend from the northern Plains to the central portion of the Great Lakes on Thursday, while a ridge of high pressure will build over the Southeast.
A low pressure system associated with a cold front will linger over the Great Lakes on Thursday. This system will trigger lake effect snow across the Great Lakes, the Northeast and into parts of the Ohio Valley. The heaviest snow can be expected in New York. Meanwhile, a low pressure system along the western portion of the frontal boundary will bring light to moderate snow showers to the northern Plains and upper Midwest. Temperatures are expected to remain 10 to 30 degrees below normal from the upper Midwest to the southern Plains on Thursday.
A ridge of high pressure will keep conditions relatively calm across the Southeast, although a frontal boundary will linger over southern Florida. This front will bring provide showers and thunderstorms to southern Florida, but wet weather should calm down by the evening. To the west, an upper level disturbance is expected to bring light showers to parts of Arizona, New Mexico, Texas and the central Rockies.
Along the West Coast, an onshore flow will push across the Pacific Northwest, which is expected to initiate showers along the coasts of Washington, Oregon and northern California. Snow will also be possible in the Cascades and parts of the northern Rockies by late Thursday evening. High pressure will keep southern California clear of wet weather.